Wenger Jay D, Swaminathan Bala, Hayes Peggy S, Green Stanley S, Pratt Mark, Pinner Robert W, Schuchat Anne, Broome Claire V
Meningitis and Special Pathogens Branch, Division of Bacterial Diseases, Center for Infectious Diseases, Centers for Disease Control, Atlanta, GA 30333.
Food Safety and Inspection Service, US Department of Agriculture, Annex Building, 300 - 12th St. S.W., Washington, DC 20250.
J Food Prot. 1990 Dec;53(12):1015-1019. doi: 10.4315/0362-028X-53.12.1015.
A facility which produced turkey franks that had been microbiologically linked to a case of human listeriosis was evaluated to establish prevalence of contamination and identify potential points for intervention. Listeria monocytogenes was isolated from only two of 41 environmental samples obtained in the plant. Among production line product samples analyzed by the Centers for Disease Control, 0 to 8% of samples from the production stages before the peeler-conveyor belt apparatus were positive for the case strain of L. monocytogenes , whereas 12 of 14 (86%) samples collected from this apparatus were positive (p <0.001). The most probable number (MPN) of L. monocytogenes in finished product purchased from a retail outlet was less than 0.3 per gram; however, the opened package of franks from the case patient's refrigerator had an MPN of >1100 per gram. These data suggest that systematic culturing and analysis of products and production facilities may help identify appropriate interventions to reduce L. monocytogenes contamination in food processing plants and contribute to control of L. monocytogenes in ready-to-eat meat products.
一家生产火鸡肉肠的工厂曾因微生物污染导致一起人类李斯特菌病病例，对该工厂进行了评估，以确定污染的发生率并找出潜在的干预点。在该工厂采集的41份环境样本中，仅从两份样本中分离出了单核细胞增生李斯特菌。在美国疾病控制中心分析的生产线产品样本中，去皮输送带装置之前生产阶段的样本中，单核细胞增生李斯特菌病例菌株的阳性率为0%至8%，而从该装置采集的14份样本中有12份（86%）呈阳性（p<0.001）。从零售商店购买的成品中，单核细胞增生李斯特菌的最可能数（MPN）低于每克0.3；然而，从病例患者冰箱中取出的已开封火鸡肉肠包装中，MPN大于每克1100。这些数据表明，对产品和生产设施进行系统培养和分析，可能有助于确定适当的干预措施，以减少食品加工厂中单核细胞增生李斯特菌的污染，并有助于控制即食肉类产品中的单核细胞增生李斯特菌。
